Knowledge Base Contributions

Below is a list of the knowledge base entries that Per M Knutsen has contributed to:

• How can I match mathematical annotation? /[\d\.\s\+\-]+/g does not work
  

• How do I pass a structure by reference and then access its elements in a sub-routine?
  How do I de-reference a structure within a sub-routine?
  

• How do I access elements in a hash of arrays?
  How do I loop over an array within a hash?
  

• How do I loop through an array?
  

• Can I read the number of lines in a file without looping?
  

• How do I plot only every X bar in an errorbar graph?
  

• How do I write to a file?
  

• How do I save a complex data-structure to disk?
  

• How do I loop through an array?
  

• How do I loop through a hash?
  

• How do I remove an element/key from a hash?
  

• How can I download a webpage and store it in a variable?
  

• How do I clear an array?
  

• How do I read the n'th line in a file?
  

• How do I start a telnet session within Emacs?
  

• How do I perform an incremental search?
  

• How do I get the size of a file?
  

• How do I remove an element from an array?
  

• How do I retrieve a list of files in a directory?
  

• How do I install new modules from CPAN?
  

• How can I make a regex return true when it doesn't match a string?
  

• How do I create a large matrix with copies of the value A?
  How should I initialise a very large matrix containing a single value?
  

• How do I bin values into a 2D histogram?
  

• How much is 1 degree visual angle in mm across the retina?
  

• What is the density of rods and cones in the cat retina?
  

• What is the density of rods and cones in the human retina?
  

• What techniques are there for measuring eye-movements?
  

• What is consciousness?
  

• How do I export my MatLab movie as an MPEG?
  

• I want complete information about Online Casino?
  

• How do I read an entire file as a string?
  

• Can I embed Perl code inside HTML documents?
  

• How do I send error messages to the browser?
  

• How do I pass arguments from a webpage to a Perl script?
  

• How can I measure the relative performance of two slightly different Perl scripts?
  

• Where can I obtain Emacs for Windows?
  

• Where can I find a quick-reference to emacs commands?
  

• Where can I get more help on XEmacs?
  

• What does the .emacs file do?
  

• Just what is Emacs, and what's in it for me?
  

• How do I load/save files to a remote machine?
  

• How do I parse nested HTML tags using regexp?
  How can I parse nested HTML tags with regular expressions?
  

• How can I find a clients geographical location from their IP address?
  

• How do I include another file in Perl output?
  

• How do I pass parameters generated by PHP script to a Perl script?
  

• I cannot write to a file using fputs when I'm inside a while loop? Why not?
  

• How can I use perl at the command line to do a Global Search & Replace within a directory? I want to remove <font WHATEVER> ... </font> but not ...
  

• What are the pros and cons of Perl compared to PHP?
  

• How can I use javascript to choose between different stylesheets for IE5 and NN4?
  

• Is there a way to safely achieve multiple simultaneous writes to a file from different instances of a script i.e. different users?
  How can I lock a file?
  

• Does anyone know how to make a db call to a Sybase db using DB-Lib?
  

• How can I use perl to split a string into equal size pieces?
  How can I break up a string into equal pieces placed in an array?
  

• How can I embed an external URL into an HTML document?
  How can I embed an external URL into an HTML document?